Poorer born, then pass on, right (7)
I believe the answer is:
needier
'poorer' is the definition.
('needy' can be similar in meaning to 'poor')
'born then pass on right' is the wordplay.
'born' becomes 'nee' (I've seen this before).
'then' says to put letters next to each other.
'pass on' becomes 'die' (I've seen this before).
'right' becomes 'r' (common abbreviation).
'nee'+'die'+'r'='NEEDIER'
(Other definitions for needier that I've seen before include "Poorer" , "More disadvantaged" , "more impoverished" , "Wanting more" , "poor, ultimately - more so than others" .)